作者:E. A. Khakina、A. S. Peregudov、S. I. Troyanov、P. A. Troshin
DOI:10.1007/s11172-012-0038-1
日期:2012.2
A series of trannulenes C60F15[CX(COOR)2]3 (X = COOMe, Br; R = Me, Et, Prn, n-Hex, But, (CH2)3NHCOOBut) was synthesized. The first water-soluble trannulenes containing six carboxyl groups (C60F15[C(COOMe)(COOH)2]3) or six protonated amino groups (C60F15[C(COOMe)(COO(CH2)3NH3 +CF3COO−)2]3) were obtained. The compositions and structures of all compounds were proved by mass spectrometry, 1H, 13C, and 19F NMR spectroscopy, and other physicochemical methods. The reactivity of trannulenes was studied for the first time. The unique isomerization of trannulenes to triumphenes accompanied by the migration of three organic addends from one hemisphere of the fullerene cage to another hemisphere was discovered. The structures of the isomerization products were proved using single-crystal X-ray diffraction analysis and 1H, 13C, and 19F NMR spectroscopy. The concerted cascade of isomerization, elimination, and addition reactions was accomplished, which made it possible to obtain photoactive dyads C60F14R2=A (R = C(X)(COOR)2, A is a fragment of fullerenes C60 or C70, anthracene, or pentacene). These dyads contain the electron-deficient fluorofullerene core and electron-donor (with respect to the fluorofullerene core of the molecule) addend A. Photoinduced charge separation can occur in these systems, which makes them analogs of natural photosynthetic antennas.
合成了一系列trannulenes C60F15[CX(COOR)2]3 (X = COOMe, Br; R = Me, Et, Prn, n-Hex, But, (CH2)3NHCOOBut)。首先获得了含六个羧基(C60F15[C(COOMe)(COOH)2]3)或六个质子化氨基(C60F15[C(COOMe)(COO(CH2)3NH3 +CF3COO−)2]3)的水溶性trannulenes。所有化合物的组成和结构都通过质谱、1H、13C和19F核磁共振谱和其他物理化学方法得到证明。首次研究了trannulenes的反应活性,发现了trannulenes独特的异构化反应,伴随着三个有机加成物从一个富勒烯笼半球迁移到另一个半球,生成了triumphenes。通过单晶X射线衍射分析和1H、13C和19F核磁共振谱证明了异构化产物的结构。协同的级联异构化、消除和加成反应得以完成,从而有可能获得光活性的二聚体C60F14R2=A (R = C(X)(COOR)2, A是富勒烯C60或C70、蒽或并五苯的片段)。这些二聚体含有缺电子的氟富勒烯核心和相对于氟富勒烯分子核心的电子供体加成物A。在这些系统中可以发生光诱导的电荷分离,使它们成为天然光合天线的类似物。